PSI stands for pounds per square inch. It is a unit of pressure that is commonly used to determine how much pressure is on some type of container. This will often apply to things like air pressure in tires, gas pressure in a pipe, and much more. All containers will have a maximum amount of pressure that they can safely withstand, so knowing what the current PSI is will help to ensure that something is not overfilled.
Most people are familiar with the concept of PSI because they must keep the tires on their vehicles filled to the proper pressure levels. Normal commuter tires generally need to have a PSI of between 32 and 60 depending on the type of tire and other factors. Industrial tires may require a higher amount of pressure to hold up the heavy equipment.
PSI is also used on gas lines, water lines, and much more. Facilities need to know what the pressure level is on these types of lines to ensure that everything is at the level it should be. If there is too much pressure, it could cause damage to the lines. If there is not enough pressure, the equipment that is using the gas, water, or other thing may not operate properly.
Many facilities even use things like water jet cutters, which use highly pressurized water to cut through hard objects. These types of equipment can operate with 40,000 to 100,000 PSI of water to get the results they need.
Being able to accurately measure the PSI of a system will help to ensure it is going to operate the way it is expected to every single time. Make sure every system that operates under pressure has a working gauge to constantly read the pressure so that teams can react if it gets too high or too low.